From the children's fantasy books, The Bone Grit Historeum
Root would have taken off then, leaving them there, groaning and dazed, but she noticed something in that pile of corn. One of the cobs had an odd reddish tinge to it. A spidering of realization took her spine. She reached for the cob and shucked it. As the silk peeled back she saw that inside was not corn at all but a stunning red jewel.